Dometic RV Air Conditioner Problems : 5 Common Issues (Explained)

If you’re a recreational traveler then you may understand the importance of a properly functioning air conditioning unit in your recreational vehicle (RV). When you’re on the road escaping from the summer heat or seeking refuge from the cold, it is essential for a comfortable journey. That’s why it’s crucial to have a reliable Dometic RV AC system. In this article we will explore the common problems that can arise with Dometic RV air conditioners and how to troubleshoot them. Let’s find out more.

Table of Contents

What Is A Dometic RV AC?

Dometic is a well-known brand in the RV industry, specializing in manufacturing high-quality air conditioning systems designed specifically for recreational vehicles. These AC units are engineered to withstand the unique challenges of the road, providing efficient cooling and heating capabilities to ensure your comfort while on the road on your travels.

Dometic RV Air Conditioner Problems

1. Low Cooling Or Weak Airflow

One of the most common problems RV owners may encounter with their Dometic RV air conditioning units is low cooling or weak airflow. If you notice that your RV is not cooling as effectively as it used to or if the airflow from the vents feels weak then it may be due to;

  • Clogged air filters
  • A faulty condenser/ evaporator coil
  • Low power supply

Troubleshooting The Low Cooling Or Weak Airflow Problem

  • First check the air filters of your Dometic RV air conditioner because given time, these air filters can become clogged with dust and debris hindering proper airflow. Remove the filters and clean them thoroughly or replace them with new ones.
  • The condenser coils are responsible for transferring heat and cooling the air. If they are dirty or damaged, they may not function optimally but cleaning the coils regularly and ensuring they are free from any obstructions can help restore the cooling and heating effect.
  • Check your RV’s electrical system and make sure that the Dometic RV air conditioner unit is receiving the correct voltage because insufficient power can cause the AC to struggle to cool effectively.
  • Be sure to consult a professional electrician to address any electrical issues.

2. Wrong Air From Vents

Imagine being stuck in your RV on a scorching summer day, only to find that your Dometic RV air conditioner is blowing warm air or not cooling at all. This can be a frustrating problem and is usually because of;

  • Wrong thermostat settings
  • A faulty compressor or fan motor
  • A leaking refrigerant

Troubleshooting The Wrong Air From Vents Problems

  • First check the thermostat settings on your Dometic AC unit and make sure that it is set to the desired temperature and cooling mode.
  • Check for any signs of damage, loose connections or unusual noises with the compressor or fan motor. If you notice any issues then it is recommended to seek professional assistance to repair or replace these components.
  • The refrigerant is responsible for absorbing heat from the air and cooling it. If there is a leak then the refrigerant levels can become insufficient thus leading to poor cooling performance.
  • However diagnosing and repairing refrigerant leaks requires specialized equipment and should be done by a qualified technician.

3. AC Not Turning On/ Off

A Dometic RV air conditioner that fails to turn on or off can be a frustrating pronlem to deal with. Whether you’re trying to escape the heat or conserve energy, it’s important to address this issue promptly. This is usually a problem with;

  • The power supply
  • The thermostat’s wiring
  • The control board

Troubleshooting The AC Not Turning On/ Off Problem

  • Check the power supply to your RV and make sure that the AC unit is receiving power and that the circuit breaker or fuse is not tripped or blown.
  • Loose or damaged wires can prevent the AC unit from receiving signals to turn on or off therefore you should carefully inspect the wiring connections and tighten or repair any loose or damaged wires.
  • A malfunctioning control board can disrupt the normal operation of the Dometic RV AC. In this case, contacting a professional technician to diagnose and repair the control board is the best course of action.

4. Leaking Water From Air Conditioner

Discovering a water leakage from your Dometic RV air conditioner can be a cause for concern. Not only can it damage your RV’s interior, but it can also indicate an underlying issue with the AC unit. This problem can be due to;

  • A blocked condensate drain
  • A faulty gasket or seal
  • Excessive condensation

Troubleshooting The Leaking Water From Air Conditioner Problem

  • Check the condensate drain line of your Dometic AC because this drain line can become clogged with dirt, debris or algae, causing water to back up and leak from the unit.
  • Also inspect the drain line for any blockages and clean it thoroughly. You can use a mixture of water and bleach to remove any algae or mold buildup.
  • If the gasket or seal is worn out or not installed correctly, water can seep through and leak inside the RV therefore you should replace the gasket or seek professional assistance to ensure proper installation.
  • Excessive condensation can occur if the AC is set to a very low temperature or if the humidity levels inside the RV are high. To reduce condensation, you should try increasing the temperature slightly or using a dehumidifier to maintain optimal humidity levels.

5. Smelly/ Musty Odors From AC

If you’re greeted by unpleasant odors emanating from your Dometic RV air conditioner, it can be very frustrating. This is a common problem that is caused by;

  • Dirty or clogged air filters
  • Dirty evaporator coil

Troubleshooting The Smelly/ Musty Odors From AC

  • First clean or replace the air filters of your Dometic RV air conditioner because these filters can accumulate dust, dirt and other particles creating a breeding ground for bacteria and mold.
  • Carefully clean the evaporator coil using a soft brush or vacuum cleaner with a brush attachment.
  • You should also consider using an air conditioner deodorizer or air purifier specifically designed for RVs. These products can help eliminate odors and improve the air quality inside your RV.

How To Prevent Problems With The Dometic RV Air Conditioner

  • Clean or replace the air filters regularly because this will improve airflow and prevent the buildup of dust and debris.
  • Inspect and clean the condenser and evaporator coils at least once a year.
  • Check the condensate drain line for any blockages and clean it as necessary.
  • Keep the area around the AC unit clean and free from any obstructions and make sure that there is proper airflow to the unit for optimal cooling performance.

How Often Should I Clean Or Replace The Air Filters Of My Dometic RV AC?

Cleaning or replacing the air filters of your Dometic RV air conditioner is recommended every 3 to 6 months but this also depends on usage and environmental conditions.

Can I Perform Repairs On My Dometic RV AC By Myself, Or Should I Seek Professional Assistance?

While some minor maintenance tasks like cleaning the filters or inspecting the coils can be done by RV owners, it is generally recommended to seek professional help for the repairs and complex troubleshooting because AC systems are very intricate and require special knowledge and tools to diagnose and fix the problems accurately.


A well-functioning Dometic RV air conditioner is essential for a comfortable and enjoyable journey and when you take the time to understanding the common problems that can occur and follow the basic troubleshooting steps in this article you will be better equipped to address the problems effectively. Remember to prioritize general maintenance to keep your Dometic RV air conditioner in great condition and enjoy the cool comforts of your RV whenever you hit the road.